noun
Vulgar slang referring to a person treated as a sexual object, or a sex doll. Strongly derogatory when applied to a person.
あの男は彼女を肉人形のように扱っている。
That man treats her like a sex doll.
ネットで肉人形を買う人が増えているらしい。
Apparently more people are buying sex dolls online.
ダッチワイフ is a common loanword for 'sex doll', whereas 肉人形 is a native Japanese slang term with a cruder nuance.
Compound of 肉 (flesh) and 人形 (doll), literally 'flesh doll'. The exact origin is uncertain, but it likely arose as vulgar slang.